"IBM now strongly recommends that the Type 113 records be collected on a continuing basis, for all z/OS LPARs."
Hartfield, VA (PRWEB) November 29, 2012
Computer Management Sciences, Inc. (CMS) has recently issued Release 22.2 of the software product, CPExpert™. CPExpert™ is an automated performance analysis tool used on IBM mainframes. The Release contains significant improvements in the analysis and features of the product, including enhancements to support z/Enterprise EC12 - IBM’s newest mainframe server that was announced in August 2012. All relevant CPExpert components have been updated to provide support for z/Enterprise EC12 mainframe server. In addition, all relevant CPExpert documentation has been updated with references to applicable z/Enterprise EC12 mainframe server documents from IBM.
With CPExpert Release 22.2, the WLM Component does basic analysis of data produced by IBM’s CPU Measurement Facility (CPU MF) and recorded in SMF Type 113 records. “I have studied the SMF Type 113 information for more than two years, using data provided by IBM and provided by several CPExpert users” said Don Deese, President of Computer Management Sciences and developer of CPExpert in a recent interview. “I don’t believe that very many people are collecting and using the Type 113 records. Possibly this is because IBM initially suggested that the Type 113 should be collected only when asked to do so by IBM. IBM now strongly recommends that the Type 113 records be collected on a continuing basis, for all z/OS LPARs. Partially this change in recommendation is because IBM realized that there is no overhead in collecting the raw measurement data (data collection is automatically done by firmware), and the SMF overhead is negligible to write the Type 113 records once every recording interval. IBM appreciates how necessary it is to capacity planning that information contained in the Type 113 records be available.”
Mr. Deese continued, “Unfortunately, it is likely that most people in the user community do not appreciate the performance analysis value of information in the Type 113 records. Many people do not fully appreciate that modern IBM computers can deliver a wide range of processor “speed” to applications, depending on where in the cache/memory hierarchy the instructions and data are located when needed. The Type 113 information can be used to show that from an application view, a processor can “appear” to run at one speed or can “appear” to run significantly slower than that speed. The speed of the processor itself does not actually change. It is the number of processor cycles required to execute an instruction that changes. Executing a hypothetical instruction might require only one processor cycle, or executing the same hypothetical instruction could take tens or hundreds of processor cycles, depending on where the instructions and data are located within the cache/memory hierarchy. While this hypothetical instruction is used to illustrate the situation, Type 113 data shows that there is indeed a wide range of instruction execution times delivered to user applications.”
The CPExpert Product Update Bulletin can be downloaded at http://www.cpexpert.com/Updates.htm
About Computer Management Sciences, Inc. (CMS):
CMS is an industry leader in automated IBM mainframe performance analysis tools and is the developer of the software product, “CPExpert™.” Incorporated in 1986, CMS has been at the forefront of creating tools to optimize IBM mainframe performance. The company’s robust product, CPExpert™, has been enhanced twice yearly since 1991 and has five components focused on WLM, DB2, CICS, WebSphere MQ, and DASD. The product automates performance degradation detection, produces reports to justify the analysis, and (most importantly) suggests solutions to performance problems identified by the software. An extraordinary amount of detailed, original documentation is included with the software product. The company’s philosophy is to provide a powerful tool at an inexpensive price. Find out more by visiting http://www.cpexpert.com
For questions about CMS or CPExpert™, please contact Don Deese at Don_Deese(at)cpexpert(dot)com.
CPExpert™ is a trademark of Computer Management Sciences, Inc.
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